FDS6676AS N-Channel MOSFET 30V 14.5A Equivalent & Substitute Parts

Part Overview

The FDS6676AS is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 14.5A continuous drain current at 25°C. The device is housed in an 8-SOIC surface mount package and features PowerTrench® and SyncFET™ technology. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, production continuity, and system maintenance. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, on-resistance, and thermal characteristics while accommodating available packaging options.

Substiute Parts

FDS6676AS

onsemiIn Stock: 42721FDS6676AS Datasheet

Current PartRFQ

FDS6676

Fairchild SemiconductorIn Stock: 22247FDS6676 Datasheet

DirectRFQ

PJQ4404P_R2_00001

Panjit International Inc.In Stock: 5975PJQ4404P_R2_00001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FDS6676AS is determined by strict alignment with the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 30V
• Continuous Drain Current (Id): Must equal or exceed 14.5A at 25°C ambient
• On-Resistance (Rds On): Must not exceed 6mOhm at rated current and gate voltage
• Gate Threshold Voltage (Vgs(th)): Must be compatible with 10V gate drive circuits
• Operating Temperature Range: Must support -55°C to 150°C minimum
• FET Type: N-Channel MOSFET technology only
• RoHS Compliance: ROHS3 Compliant status required

Secondary Compatibility Factors:

• Package form factor (8-SOIC preferred for direct PCB replacement; alternative packages acceptable with board redesign)
• Gate charge and input capacitance characteristics (affect switching performance)
• Power dissipation capability (thermal management consideration)

The substitute parts listed below satisfy these criteria within the specified parameter tolerances.

Parameter Comparison

Engineering Selection Recommendations

FDS6676 (Fairchild Semiconductor) – Direct Substitute:

The FDS6676 is classified as a direct manufacturer equivalent with active product status. This part maintains identical voltage and current ratings (30V, 14.5A) and shares the same 8-SOIC package form factor, enabling direct PCB replacement without layout modification. The on-resistance specification of 7mOhm at rated conditions is marginally higher than the FDS6676AS (6mOhm), resulting in approximately 17% increased conduction losses. This difference is acceptable for most applications where thermal management is adequate. The FDS6676 features an extended operating temperature range (-55°C to 175°C) compared to the FDS6676AS (-55°C to 150°C), providing additional thermal margin. ROHS3 compliance and MSL 1 rating confirm environmental and handling compatibility. Active product status ensures ongoing availability and supply chain stability.

PJQ4404P_R2_00001 (Panjit International Inc.) – Similar Substitute:

The PJQ4404P_R2_00001 is classified as a similar substitute with active product status. This part meets the 30V voltage requirement and exceeds the current rating (15A at Ta, 60A at Tc). The on-resistance specification of 6mOhm at 10A, 10V matches the FDS6676AS performance. However, this part uses a DFN3333-8 (8-PowerVDFN) package instead of 8-SOIC, requiring PCB layout redesign and footprint modification. The significantly lower gate charge (12nC versus 63nC) and reduced input capacitance (1323pF versus 2510pF) indicate faster switching characteristics, which may require gate drive circuit adjustment. The enhanced thermal capability (31W at Tc) supports higher power dissipation applications. ROHS3 compliance and MSL 1 rating confirm regulatory alignment. This substitute is suitable for new designs or redesign projects where package change is acceptable.

Compliance and Certification Basis:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices. The FDS6676 and PJQ4404P_R2_00001 are both active products with established supply chains, supporting long-term design continuity beyond the obsolete FDS6676AS.

Frequently Asked Questions (FAQ)

Q: Can the FDS6676 be used as a direct replacement for the FDS6676AS without PCB modification?

A: Yes. The FDS6676 shares the identical 8-SOIC package footprint and pinout with the FDS6676AS. Direct PCB replacement is possible without layout changes. The 1mOhm increase in on-resistance (7mOhm versus 6mOhm) results in proportionally higher conduction losses but remains within acceptable limits for most applications with adequate thermal design.

Q: What is the primary difference between the FDS6676 and PJQ4404P_R2_00001?

A: The FDS6676 uses an 8-SOIC package identical to the FDS6676AS, while the PJQ4404P_R2_00001 uses a DFN3333-8 (8-PowerVDFN) package. The PJQ4404P_R2_00001 features significantly lower gate charge (12nC versus 63nC) and input capacitance (1323pF versus 2510pF), enabling faster switching operation. The PJQ4404P_R2_00001 also provides higher current capability at case temperature (60A at Tc). Package selection depends on whether PCB redesign is acceptable.

Q: Are all substitute parts RoHS compliant?

A: Yes. Both the FDS6676 and PJQ4404P_R2_00001 are ROHS3 Compliant, matching the environmental compliance status of the FDS6676AS. All parts carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the impact of the FDS6676's extended operating temperature range?

A: The FDS6676 supports operation from -55°C to 175°C (junction temperature), compared to the FDS6676AS range of -55°C to 150°C. This 25°C additional upper temperature margin provides enhanced thermal headroom in high-temperature applications, reducing the risk of thermal shutdown or performance degradation.

Q: Does the PJQ4404P_R2_00001 require gate drive circuit modifications?

A: The PJQ4404P_R2_00001 has a lower gate threshold voltage (2.5V versus 3V) and significantly lower gate charge (12nC versus 63nC). Existing gate drive circuits designed for the FDS6676AS will function with the PJQ4404P_R2_00001, but optimization of gate drive timing and current may improve switching performance. Verification of gate drive voltage compatibility (±20V maximum for both parts) is required.

Q: Which substitute part is recommended for new designs?

A: For new designs where package flexibility exists, the PJQ4404P_R2_00001 offers superior switching characteristics and thermal performance. For designs requiring minimal modification or direct PCB replacement, the FDS6676 is the appropriate choice. Both parts are active products with established supply availability.

Q: What are the inventory implications of selecting a substitute part?

A: The FDS6676 has 22,200 pieces in stock, while the PJQ4404P_R2_00001 has 5,877 pieces available. The FDS6676AS (obsolete) has 42,700 pieces in current inventory. Substitute part selection should account for production volume requirements and supply chain lead times.